If the adjacent angles of a cyclic quadrilateral are 40 and 100 degree then the angle made by the diagonals at the centre is​

In the above figure, ABCD is a cyclic quadrilateral and /_BCD =2 /_ BAD . Find the angle made by the diagonal BD at the centre of the circle.

Three angles of a quadrilateral are 50°, 40° and 123°. Find its fourth angle.

The opposite angles of a cyclic quadrilaterals are supplimentary

The two adjacent sides of a cyclic quadrilateral are 2 cm and 5 cm and the angle between them is 60^(@) . If the third side is 3 cm, then the fourth side is of length

The measures of two angles of a cyclic quadrilateral are 40^(@) and 110^(@) Then, the measures of other two angles of the quadrilateral are ..........